package com.example.security.demo.service;


import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.authority.AuthorityUtils;
import org.springframework.security.core.userdetails.User;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.stereotype.Service;


//UserDetailsService的实现类
@Service
public class UserDetailsServiceImpl implements UserDetailsService {

    @Autowired(required = false)
    private PasswordEncoder pw;

    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {

        System.out.println("运行到这里了");


        //1.查询数据库判断用户是否存在. 如果不存在就会抛出用户名不存在异常
        if(!"admin".equals(username)){
            throw  new UsernameNotFoundException("用户名不存在");
        }
        //2.把查询出来的密码(注册时加密过的密码)进行解析, 或者直接把密码放入构造方法
        String password = pw.encode("123");
        //注意这个User的类型
        return new User(username, password, AuthorityUtils.commaSeparatedStringToAuthorityList("admin, normal"));
    }
}
